Improvement in water-wheels



UNITED STATES- PATENT OFFICE.

SAMUEL HOPPER, on LEwIsTowN, PENNSYLVANIA.

IMPROVEMENT IN WATER-WHEELS.

Specification forming part of Letters Patent No. 3,011, dated March 21,1843.

.and mold of 'core 'surface of theV cone A. These project out a littlefarther at the top than at the base, gradually tapering from one end tothe other. These buckets are inclosed on their outside by a rim C. madeas much less obtuse than the inner rim A as the buckets taper. This rimis wide enough to extend from the upper outside corner of the bucket tothe lower outside corner. Around the upper edge of the rim C there is aiiange c, which extends outward at right angles to the shaft andprojects out nearly as far as the base of the outside rim. This wheel isattached to the shaft in the usual way and is placed in the bottom ofthe forebay where segment-pieces are fitted in around it under theflange, so as to keep it from leaking. The forebay and other fixturesare similar to those in common use.

lVhen the wheel is put in operation, the water has its full effect uponit, there being no projections on the wheel to retard its motion, and asthe vent is but slightly contracted the water finds a free egress fromthe wheel, having expended its entire and unimpeded force upon it.

In preparing the Inold for casting this wheel patterns are formed of theouter and inner rims. On these are scribed the places for the buckets,which is done by a patterncurve, which is marked out by a spiral line.Two buckets are then made to tit the scribes on the rims, and they areall put in place. A piece of wood is then iitted into the space betweenthe lower edges of the buckets and one into the space between the upperedge otl by the buckets and rims at the sides and thev print-box below.The plaster when set is then -taken out and represents the exact formthe core is to be. A box is then fitted to this core-pattern, and inthat the sand cores are all made. The rest of the mold is formed in theusual Way and the cores are placed in their proper positions and thecasting made.

Having thus fully described the construction and operation of my wheel,I wish to have it understood that I do not claim the conical wheel, nordo I claim the spiral bucket separately; but

What I do claim as myinvention, and desire to secure by Letters Patent,is-

The combination of the conical wheel and spiral buckets, in the mannerand for the purpose herein set forth.

SAMUEL HOPPER.

Witnesses:

J. J. GREENOUGH, GEO. T. MELLEN.

